如果你想要一个更有效的答案，扩展subprocess.check_call。您可以首先使用pkg_resources检查需求是否已经得到满足。

这适用于不同的需求说明符，这很好。例如>=，==

import sys
import subprocess
import pkg_resources
from pkg_resources import DistributionNotFound, VersionConflict

def should_install_requirement(requirement):
    should_install = False
    try:
        pkg_resources.require(requirement)
    except (DistributionNotFound, VersionConflict):
        should_install = True
    return should_install


def install_packages(requirement_list):
    try:
        requirements = [
            requirement
            for requirement in requirement_list
            if should_install_requirement(requirement)
        ]
        if len(requirements) > 0:
            subprocess.check_call([sys.executable, "-m", "pip", "install", *requirements])
        else:
            print("Requirements already satisfied.")

    except Exception as e:
        print(e)

使用示例:

requirement_list = ['requests', 'httpx==0.18.2']
install_packages(requirement_list)

相关信息Stackoverflow问题:58612272

如果你想使用pip安装所需的包，并在安装后导入，你可以使用这段代码:

def install_and_import(package):
    import importlib
    try:
        importlib.import_module(package)
    except ImportError:
        import pip
        pip.main(['install', package])
    finally:
        globals()[package] = importlib.import_module(package)


install_and_import('transliterate')

如果您以用户身份安装包，可能会遇到不能直接导入包的问题。参见如何刷新sys.path?获取更多信息。

试试下面的方法。到目前为止，对我来说是最好的 首先安装4个，然后在REQUIRED列表中提到新的

import pkg_resources
import subprocess
import sys
import os

REQUIRED = {
  'spacy', 'scikit-learn', 'numpy', 'pandas', 'torch', 
  'pyfunctional', 'textblob', 'seaborn', 'matplotlib'
}

installed = {pkg.key for pkg in pkg_resources.working_set}
missing = REQUIRED - installed

if missing:
    python = sys.executable
    subprocess.check_call([python, '-m', 'pip', 'install', *missing], stdout=subprocess.DEVNULL)

如果你想要一个更有效的答案，扩展subprocess.check_call。您可以首先使用pkg_resources检查需求是否已经得到满足。

这适用于不同的需求说明符，这很好。例如>=，==

import sys
import subprocess
import pkg_resources
from pkg_resources import DistributionNotFound, VersionConflict

def should_install_requirement(requirement):
    should_install = False
    try:
        pkg_resources.require(requirement)
    except (DistributionNotFound, VersionConflict):
        should_install = True
    return should_install


def install_packages(requirement_list):
    try:
        requirements = [
            requirement
            for requirement in requirement_list
            if should_install_requirement(requirement)
        ]
        if len(requirements) > 0:
            subprocess.check_call([sys.executable, "-m", "pip", "install", *requirements])
        else:
            print("Requirements already satisfied.")

    except Exception as e:
        print(e)

使用示例:

requirement_list = ['requests', 'httpx==0.18.2']
install_packages(requirement_list)

相关信息Stackoverflow问题:58612272

    import pip

try:
    import imaplib
    import email
    import pandas as pd
    # for hiding password
    from pathlib import Path
    from dotenv import load_dotenv
    import os
    import requests
    # 
    from collections import defaultdict
    from itertools import permutations,combinations
except Exception as e:
    print(e)
    e = str(e).split(' ')[-1].replace("'","")
    pip.main(['install', e])

我在@Aaron的回答中添加了一些异常处理。

import subprocess
import sys

try:
    import pandas as pd
except ImportError:
    subprocess.check_call([sys.executable, "-m", "pip", "install", 'pandas'])
finally:
    import pandas as pd